On Fri, 15 Oct 2010, Ingo Molnar wrote:

quoted text
> Can we automate it perhaps? Drivers could express their zone needs, and 
> perhaps we can free up the zone if there's no relevant driver loaded by 
> the time we have booted up? If a hotplug driver arrives later on, is the 
> MM good enough for us to be able to reinstate the zone dynamically?
> 

That's the same as setting /proc/sys/vm/lowmem_reserve_ratio to 0 for all 
zones so that no lowmem is reserved specifically for DMA allocations.  
Then, ZONE_DMA becomes like any other zone and is open to all allocations.
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